Guitarist Steve Gunn has emerged as a singer/songwriter, an artist whose exploratory playing style pushes toward undulating organic songs. With his third album in that capacity, his first on Matador, Gunn continues writing material that unspools with a hypnotic, natural flow, more like the curling shapes of a nautilus than the grid-like regularity of song form. Repeating and varied patterns are part of music’s pleasures, and Gunn’s songs have recurring parts. They cycle around themselves, but Gunn wedges in clever destabilizing tidbits that complicate the patterns. Songs like “Night Wander” are nonlinear but ordered. On “Nature Driver,” a four-note phrase repeats, but it starts on different parts of the beat as it circles itself, with each shifting accent changing the color of the melodic line. Elegant descending guitar figures unfurl and glide, and Gunn endstops some lines by nudging in repeating two-note accents. The theme of stasis within flow, or the paradox of motion within stillness, pops up on songs like “Full Moon Tide” and “The Drop,” and it relates to the music itself, which embodies those seeming polarities. Listened to one way, these songs aren’t roomy, in that the spaces are luxuriantly filled; but listened to another way, the songs are porous, soaking up whatever Gunn ladles onto them.